Synthesis, characterization and gas sensing property of hydroxyapatite ceramic |
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Authors: | M P Mahabole R C Aiyer C V Ramakrishna B Sreedhar R S Khairnar |
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Affiliation: | (1) School of Physical Sciences, Swami Ramanand Teerth Marathwada University, 431 606 Nanded, India;(2) Department of Physics, University of Pune, 411 007 Pune, India;(3) Indian Institute of Chemical Technology, 500 007 Hyderabad, India |
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Abstract: | Hydroxyapatite (HAp) biomaterial ceramic was synthesized by three different processing routes viz. wet chemical process, microwave
irradiation process, and hydrothermal technique. The synthesized ceramic powders were characterized by SEM, XRD, FTIR and
XPS techniques. The dielectric measurements were carried out as a function of frequency at room temperature and the preliminary
study on CO gas sensing property of hydroxyapatite was investigated. The XRD pattern of the hydroxyapatite biomaterial revealed
that hydroxyapatite ceramic has hexagonal structure. The average crystallite size was found to be in the range 31–54 nm. Absorption
bands corresponding to phosphate and hydroxyl functional groups, which are characteristic of hydroxyapatite, were confirmed
by FTIR. The dielectric constant was found to vary in the range 9–13 at room temperature. Hydroxyapatite can be used as CO
gas sensor at an optimum temperature near 125°C. X-ray photoelectron spectroscopic studies showed the Ca/P ratio of 1.63 for
the HAp sample prepared by chemical process. The microwave irradiation technique yielded calcium rich HAp whereas calcium
deficient HAp was obtained by hydrothermal method. |
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Keywords: | Hydroxyapatite biomaterial ceramics gas sensor X-ray photoelectron spectroscopy infrared spectroscopy |
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